Most complex tasks are solved using abstractions. To create an abstraction one groups lower-level concepts, what I will call primitives in this text, and make them interact in a pre-defined way.
Abstractions are present at all levels in a system. Computers work based on electric signals. To reduce the Essential Complexity we abstract those signals with […]
Last week, Cauê and I were refactoring some classes in our systems and faced an interesting situation.
In our application we have a notifications system. It is quite simple; notifications are read from a text file and shown in a small information box in the home page. The MVC controller –it’s a Java application and we […]
At ThoughtWorks, our preferred way to start a project is by doing a set of workshops and sessions with stakeholders for about two weeks. That’s what we call Inception. After the Inception we usually have a product backlog for the project and are ready to start writing production code.
During that period, we often come up […]
Weeks ago, some people in the Ubuntu community got a bit disappointed with the distribution’s core team:
> We are supposed to be a community, we all use Ubuntu and contribute
> to it, and we deserve some respect regarding these kind of decisions.
> We all make Ubuntu together, or is it a big lie?
We all make […]
Over the years I’ve been part of many recovery projects. What I mean by “recovery project” is usually a project-inside-a-project that is started when the original project was clearly not going to meet its objectives. Each project fails in a unique way, but often failure is characterised by not fulfilling the stakeholder’s expectations.
There are […]
Over the past years I’ve held many workshops on Domain-Driven Design. We had more than one hundred people on those sessions, and feedback was often pretty good. After my last run I told my business partner that this was my last time running those workshops.
I think that Domain-Driven Design is one of the most […]
We finished last post with this funny situation: the abstraction that represents Facebook depends on our Domain Model.
It was a bit obvious that what we needed was not only system abstractions for Facebook, Twitter and the like but Bounded Contexts. We need to acknowledge the fact that these domains are not part of our model, […]
Read the first post here.
In the previous post we were facing the problem demonstrated by the diagram below.
Our FacebookMessageParser needs an instance of AllSocialNetworks so that it can create valid Users coming from Facebook. The only implementation we have for the AllSocialNetworks interface is UserRepository, and this implementation needs a FacebookMessageParser. That’s a circular dependency, […]
I’ve been extremely busy with project after project in the past few months, leaving me no time to do any research and/or play around interesting things. Even though I prefer to write about what is really interesting me at a given moment, I think that writing about some smaller/simpler problems and solutions would be better […]
I just finished reading Peter Seibel’s new book, Coders at Work.
I was a bit skeptical at first. I only picked the book because of the big names on the cover and because Peter Siebel’s Practical Common Lisp is one of my favourite books on learn-a-new-programming-language. I thought that a book filled only with interviews with […]
Archive for Phillip Calçado.
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